code: def test_invalid_glassbox_explainer():
      class InvalidGlassboxExplainer(ExplainerMixin):
          explainer_type = "model"
          available_explanations = ["local"]
  
      assert not _is_valid_glassbox_explainer(InvalidGlassboxExplainer)
      assert not _is_valid_glassbox_explainer(NotEvenAnExplainer)
  
file_path: interpret/python/interpret-core/tests/ext/test_examples.py
imports: from interpret.glassbox import LinearRegression
  from interpret.api.base import ExplainerMixin
  from interpret.ext.extension import _is_valid_blackbox_explainer, _is_valid_provider, _is_valid_glassbox_explainer, _is_valid_greybox_explainer, _is_valid_data_explainer, _is_valid_perf_explainer
label_desc: Use image node_id 5 for calling a global function with example usage: test_invalid_glassbox_explainer() without return types